我正在为Yii2 ActiveForm复选框控件的“已检查”状态寻找一个简单的解决方案，我找不到如何设置它的解决方案。我无法在文档中找到任何示例。
我试图操纵渲染代码
> str(dff)
'data.frame': 10 obs. of 6 variables:
$ MCI ID: chr "070405344" "230349820" "260386435" "370390587" ...
$ 123a_1: Date, format: "2015-08-25" "2014-10-29" "2015-10-22" ...
$ 123a_2: Date, format: "2016-08-16" "2014-12-18" "2016-10-14" ...
$ 123a_3: Date, format: NA NA NA ...
$ 123a_4: Date, format: NA NA NA ...
$ 123a_5: Date, format: NA NA NA ...
> dff$groupmin <- pmin(dff[[2]],dff[[3]],dff[[4]], dff[[5]], dff[[6]], na.rm=TRUE)
> head(dff)
MCI ID 123a_1 123a_2 123a_3 123a_4 123a_5 groupmin
1 070405344 2015-08-25 2016-08-16 <NA> <NA> <NA> 2015-08-25
2 230349820 2014-10-29 2014-12-18 <NA> <NA> <NA> 2014-10-29
3 260386435 2015-10-22 2016-10-14 <NA> <NA> <NA> 2015-10-22
4 370390587 2015-09-10 2016-08-23 <NA> <NA> <NA> 2015-09-10
5 380406805 2015-09-22 2016-09-13 <NA> <NA> <NA> 2015-09-22
6 391169282 2015-12-14 2016-12-05 <NA> <NA> <NA> 2015-12-14
那么如何设置activeChechbox来检查？